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51
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Maçôas EMS, Khriachtchev L, Pettersson M, Fausto R, Räsänen M. Rotational Isomerism in Acetic Acid: The First Experimental Observation of the High-Energy Conformer. J Am Chem Soc 2003; 125:16188-9. [PMID: 14692750 DOI: 10.1021/ja038341a] [Citation(s) in RCA: 102] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Abstract
The high-energy conformer of acetic acid (cis-AA) is produced in an Ar matrix by vibrational excitation of the OH stretching overtone of the ground conformational state (trans-AA). IR-absorption spectroscopy provides a clear identification of the reaction product. cis-AA converts back to trans-AA in a time scale of minutes at 8 K by tunneling.
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Affiliation(s)
- Ermelinda M S Maçôas
- Laboratory of Physical Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland
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52
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Guo Y, Thompson DL. A theoretical study ofcis–transisomerization in HONO using an empirical valence bond potential. J Chem Phys 2003. [DOI: 10.1063/1.1530585] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.3] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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53
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Pettersson M, Maçôas EMS, Khriachtchev L, Lundell J, Fausto R, Räsänen M. Cis→transconversion of formic acid by dissipative tunneling in solid rare gases: Influence of environment on the tunneling rate. J Chem Phys 2002. [DOI: 10.1063/1.1521429] [Citation(s) in RCA: 148] [Impact Index Per Article: 6.7] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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54
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Khriachtchev L, Macoas E, Pettersson M, Rasanen M. Conformational memory in photodissociation of formic acid. J Am Chem Soc 2002; 124:10994-5. [PMID: 12224943 DOI: 10.1021/ja0269791] [Citation(s) in RCA: 66] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/30/2022]
Abstract
The trans and cis forms of formic acid (HCOOH) in solid argon favor essentially different photodissociation (193 nm) products, H2O + CO and H2 + CO2, respectively. The branching ratio of these channels differs between the two conformers by a factor of >10. The observed selective photodissociation features conformational memory when the transition state of a molecule is reached before torsional randomization. These data demonstrate that the photodissociation products can be efficiently steered with selective narrow-band infrared radiation promoting rotational isomerism, which makes a strong case of optically controlled chemical reactions
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Affiliation(s)
- Leonid Khriachtchev
- Laboratory of Physical Chemistry, P.O. Box 55, FIN-00014 University of Helsinki, Finland.
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55
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Vibrational spectroscopy and ab initio MO study of the molecular structure and vibrational spectra of α- and γ-pyrones. J Mol Struct 2001. [DOI: 10.1016/s0022-2860(01)00639-1] [Citation(s) in RCA: 13] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
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56
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Maçôas EMS, Fausto R, Lundell J, Pettersson M, Khriachtchev L, Räsänen M. A Matrix Isolation Spectroscopic and Quantum Chemical Study of Fumaric and Maleic Acid. J Phys Chem A 2001. [DOI: 10.1021/jp003802p] [Citation(s) in RCA: 51] [Impact Index Per Article: 2.2] [Reference Citation Analysis] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/28/2022]
Affiliation(s)
- Ermelinda M. S. Maçôas
- Department of Chemistry - CQC, University of Coimbra, P-3049 Coimbra, Portugal, and Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Helsinki, Finland
| | - Rui Fausto
- Department of Chemistry - CQC, University of Coimbra, P-3049 Coimbra, Portugal, and Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Helsinki, Finland
| | - Jan Lundell
- Department of Chemistry - CQC, University of Coimbra, P-3049 Coimbra, Portugal, and Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Helsinki, Finland
| | - Mika Pettersson
- Department of Chemistry - CQC, University of Coimbra, P-3049 Coimbra, Portugal, and Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Helsinki, Finland
| | - Leonid Khriachtchev
- Department of Chemistry - CQC, University of Coimbra, P-3049 Coimbra, Portugal, and Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Helsinki, Finland
| | - Markku Räsänen
- Department of Chemistry - CQC, University of Coimbra, P-3049 Coimbra, Portugal, and Laboratory of Physical Chemistry, University of Helsinki, P.O. Box 55 (A.I. Virtasen aukio 1), FIN-00014 Helsinki, Finland
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